摘要
提出了一款新颖的应用于感知物联网的方向图可重构的RFID超高频电子标签天线。该RFID超高频电子标签天线为应用于金属物品的偶极子天线，创新地在RFID超高频电子标签天线中采用汉字结构；偶极子天线应用“铰链型”可旋转结构，在0~90°范围内调控超高频电子标签天线的偶极子臂的夹角，进而实现电子标签天线的阻抗实部在0~90Ω范围以及虚部在150~260Ω范围内可调，方向图在边射（约0°）和前向端射（约-90°）范围内调控；在该超高频天线偶极子臂夹角固定为某一特定角度（以60°为例）的前提下，通过在”铰链型”天线的上层加一层介质和电磁带隙栅格结构进一步调控方向图的辐射方向（以60°夹角为例，可进一步调控30°~40°）。实际测试结果验证了RFID超高频电子标签天线的可翻转偶极子臂对方向图的调控性，以及EBG结构对方向图辐射方向的可调控性。在此探索了可重构天线在RFID超高频电子标签天线的延伸，尤其提出并验证了可翻转偶极子臂以及EBG对RFID超高频电子标签天线的方向图及方向图辐射方向的可调控性能。
A hinge？type ultrahigh frequency RFID（radio frequency identification）antenna with reconfigurable radiation pat-tern is proposed for cognitive Internet of Things（CIOT）. The antenna is a dipole antenna applied to metal object. It was ana？lyzed with FEM（finite element method）. The hinge-type structure enables the dipole antenna to be rotatable and by rotating the angle between the two antenna arms from 0 degree to 90 degree. Its radiation pattern can be reconfigured form 40° to -90° （assuming the axis vertical to ground is 0°）. Moreover,EBG（electromagnetic band-gap）structure is applied to realize further reconfigurable radiation patters. Specifically,taking 60° as an example,by tuning the size of rectangular hole of EBG,its radia？tion patterns could be tuned ±30°. The reconfigurable radiation pattern is qualitatively verified in an experiment by performance measurement system.
出处
《现代电子技术》
北大核心
2015年第6期78-82,共5页
Modern Electronics Technique
